Converter · Unit & Scale

Converter

Precise unit conversion and drawing-scale math for architecture and product work. Runs in your browser — no server call, no tracking.

Unit Converter

Value

From

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Architecture Scale

Real size (m)

Scale ratio (1:n)

Drawing size: —

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Metric & Imperial in the Same Pipeline

3D assets move between DCC tools, engines, and CAD packages that don't all default to the same unit — a model authored in inches imported into a meter-scene engine will be off by a factor of 39.37 if nobody catches it. This is one of the most common real-world 3D pipeline bugs.

Drawing Scale Notation

Architectural and product drawings use ratio notation (1:100, 1:50, 1:20) to describe how a scaled drawing relates to real-world size — a 1:100 drawing means 1 unit on paper equals 100 of the same unit in reality, regardless of what unit you're using.

Reference

Reference data

Standards and values to use alongside the tool above.

Architecture Scale Standards

Scale	1mm on drawing =	Use	Common In
1:1	1 mm	Full-size details, templates	Shop drawings
1:5	5 mm	Component details, joinery	Furniture design
1:10	10 mm	Wall sections, room details	Interior design
1:20	20 mm	Room layouts, elevations	Architecture
1:50	50 mm	Floor plans, sections	Architecture (default)
1:100	100 mm	Building plans, multi-floor	Architecture
1:200	200 mm	Large buildings, site context	Urban design
1:500	500 mm	Site plans, campus layout	Landscape architecture
1:1000	1 m	Neighborhood plan	Urban planning
1:2500	2.5 m	District/city overview	Master planning

3D Software Default Units

Software	Default Unit	1 unit =	Notes
Blender	meter	1 m	Unit scale adjustable in scene
3ds Max	system unit	1 inch	Display units separate from system units
Maya	centimeter	1 cm	Working units in preferences
Cinema 4D	centimeter	1 cm	Project scale in project settings
Houdini	meter	1 m	Hip file unit scale
Rhino	millimeter	1 mm	Set per file, check on import
SketchUp	inch	1 in	Template sets default
Revit	foot	1 ft	Imperial or metric per project
AutoCAD	millimeter	1 mm	Unitless internally
Unity	meter	1 m	FBX import scale = 0.01 by default
Unreal	centimeter	1 cm	FBX import scale = 1.0

Polygon Budget Guide

Target	Budget	Triangle Range	Notes
Mobile game prop	Low	100–1K	Baked normals, atlas textures
Mobile game character	Low	1K–5K	LOD chain recommended
PC/Console prop	Medium	1K–10K	PBR textures, instanced
PC/Console character	Medium	10K–50K	Skeletal mesh, blend shapes
Film/cinematic asset	High	100K–1M	Subdivision, displacement
Arch-viz scene	High	1M–50M	Full scene, instancing critical
Web / glTF viewer	Tight	5K–100K	Draco compression, max 20MB
AR (phone)	Tight	10K–50K	Single object, LOD auto